Property talk:P284

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Library of Congress authority ID
Library of Congress name authority (persons, families, corporate bodies, events, places, works and expressions) and subject authority identifier [Format: 1-2 specific letters followed by 8-10 digits (see regex).]
[create Create a translatable help page (preferably in English) for this property to be included here]
Format “(|((n|nb|nr|no|ns|sh|gf)([4-9][0-9]|00|20[0-2][0-9])[0-9]{6})): value must be formatted using this pattern (PCRE syntax).
Exceptions are possible as rare values may exist.
List of this constraint violations: Database reports/Constraint violations/P284#Format, SPARQL